Synthesis of a new Pd(II) complex with tridentate nitrogen ligands and investigation of its catalytic property

A new tridentate nitrogen ligand with a 4-position substituted active functional group in the pyridine ring was successfully prepared from chelidamic acid via the processes of esterification, reduction, bromization and amination, and then further reacted with palladium chloride to give the palladium(II) complex. The complex was characterized by IR, ¹H, ¹³C NMR spectra, elementary analysis etc. The catalytic properties of the new pincer-type NN'N complex for Heck arylation of aryl halides with alkenes were investigated. The results showed that the complex had high catalytic activities.